创建和读写文件的一些简单方法

1 使用StreamWriter向文件写入数据

public static void WriteToLog(string logFileName, string data)
        {
            using (FileStream fileStream = new FileStream(logFileName, FileMode.Append, FileAccess.Write, FileShare.None))
            {
                using (StreamWriter streamWrtie = new StreamWriter(fileStream))
                {
                    streamWrtie.Write(data);
                }
            }
        }

public static void WriteToLog(string logFileName, string data) { using (FileStream fileStream = new FileStream(logFileName, FileMode.Append, FileAccess.Write, FileShare.None)) { using (StreamWriter streamWrtie = new StreamWriter(fileStream)) { streamWrtie.Write(data); } } }

2 用StreamReader读取文本

public static string  ReadAllLog(string logFileName)
       {
           if (!File.Exists(logFileName))
           {
               throw (new FileNotFoundException("logfile does not exit", logFileName));
           }
           string contents = "";
           using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None))
           {
               using (StreamReader streamRead = new StreamReader(fileStream))
               {
                   contents = streamRead.ReadToEnd();
               }
           }
           return contents;
       }

public static string ReadAllLog(string logFileName) { if (!File.Exists(logFileName)) { throw (new FileNotFoundException("logfile does not exit", logFileName)); } string contents = ""; using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None)) { using (StreamReader streamRead = new StreamReader(fileStream)) { contents = streamRead.ReadToEnd(); } } return contents; }

3 要逐行的读取文本，则使用peek（）方法

public static void ReadLogPeeking(string logFileName)
        {
            if (!File.Exists(logFileName))
            {
                throw (new FileNotFoundException("logfile does not exit", logFileName));
            }
            using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None))
            {
                using (StreamReader streamReader = new StreamReader(fileStream))
                {
                    while (streamReader.Peek() != -1)
                    {
                        Console.WriteLine(streamReader.ReadLine());
                    }
                }
            }
        }

public static void ReadLogPeeking(string logFileName) { if (!File.Exists(logFileName)) { throw (new FileNotFoundException("logfile does not exit", logFileName)); } using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None)) { using (StreamReader streamReader = new StreamReader(fileStream)) { while (streamReader.Peek() != -1) { Console.WriteLine(streamReader.ReadLine()); } } } }

或

public static void ReadLogByLines(string logFileName)
        {
            if (!File.Exists(logFileName))
            {
                throw (new FileNotFoundException("logfile does not exit", logFileName));
            }
            using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None))
            {
                using (StreamReader streamReader = new StreamReader(fileStream))
                {
                    string text = streamReader.ReadLine();
                    while (text != null)
                    {
                        Console.WriteLine(text);
                        text = streamReader.ReadLine();
                    }
                }
            }
        }

public static void ReadLogByLines(string logFileName) { if (!File.Exists(logFileName)) { throw (new FileNotFoundException("logfile does not exit", logFileName)); } using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None)) { using (StreamReader streamReader = new StreamReader(fileStream)) { string text = streamReader.ReadLine(); while (text != null) { Console.WriteLine(text); text = streamReader.ReadLine(); } } } }

4 若要读取一个字节则用read()方法

public static void ReadLogAsBytes(string logFileName)
       {
           if (!File.Exists(logFileName))
           {
               throw (new FileNotFoundException("logfile does not exit", logFileName));
           }
           using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None))
           {
               using (StreamReader streamReader = new StreamReader(fileStream))
               {
                   while (streamReader.Peek() != -1)
                   {
                       Console.WriteLine(streamReader.Read());
                   }
               }
           }
       }

public static void ReadLogAsBytes(string logFileName) { if (!File.Exists(logFileName)) { throw (new FileNotFoundException("logfile does not exit", logFileName)); } using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None)) { using (StreamReader streamReader = new StreamReader(fileStream)) { while (streamReader.Peek() != -1) { Console.WriteLine(streamReader.Read()); } } } }

5 按块读取，则要创建一个任意长度的缓冲区,这个长度根据你的性能需求来决定

public static void ReadAllBuffereLog(string logFileName)
        {
            if (!File.Exists(logFileName))
            {
                throw (new FileNotFoundException("logfile does not exit", logFileName));
            }
            using (FileStream fileStream = new FileStream(logFileName, FileMode.Open, FileAccess.Read, FileShare.None))
            {
                using (StreamReader streamReader = new StreamReader(fileStream))
                {
                    while (streamReader.Peek() != -1)
                    {
                        char[] buffer=new char [10];
                        int bufferFileSize = streamReader.Read(buffer, 0, 10);
                        foreach (char c in buffer)
                        {
                            Console.Write(c);
                        }
                        Console.WriteLine();
                        Console.WriteLine(bufferFileSize);
                    }
                }
            }
        }